REDUCTION OF THE OXIDIZED SURFACE OF COBALT-RHENIUM ALLOYS WITH CHROMIUM FROM THE GAS PHASE

The development of new cobalt-based heat-resistant alloys for aerospace industry allows to go beyond the temperature capabilities of nickel superalloys, however, cobalt alloys are less resistant to high-temperature oxidation, and alloying cobalt alloys with aluminum or chromium can lead to the formation of brittle topologically dense phases. As a solution to this problem, surface alloying with chromium of cobalt alloys is proposed, carried out by interaction of their pre-oxidized surface with chromium from gas phase.